化工学报 ›› 2021, Vol. 72 ›› Issue (9): 4616-4628.DOI: 10.11949/0438-1157.20201949

• 流体力学与传递现象 • 上一篇    下一篇

车用热泵内部冷凝器结构对性能的影响

赵兰萍1(),郭本涛1,2,杨志刚2   

  1. 1.同济大学机械与能源工程学院,上海 2018084
    2.同济大学上海市地面交通工具 空气动力与热环境模拟重点实验室,上海 201804
  • 收稿日期:2021-01-03 修回日期:2021-05-13 出版日期:2021-09-05 发布日期:2021-09-05
  • 通讯作者: 赵兰萍
  • 作者简介:赵兰萍(1967—),女,博士,副教授, Lanpingzhao@toingji.edu.cn
  • 基金资助:
    上海市地面交通工具空气动力与热环境模拟重点实验室项目(18DZ2273300)

Effect of structure on the performance of inner condenser for heat pump of EV

Lanping ZHAO1(),Bentao GUO1,2,Zhigang YANG2   

  1. 1.School of Mechanical Engineering,Tongji University,Shanghai 201804,China
    2.Shanghai Key Laboratory of Vehicle Aerodynamics and Vehicle Thermal Management Systems,Tongji University,Shanghai 201804,China
  • Received:2021-01-03 Revised:2021-05-13 Online:2021-09-05 Published:2021-09-05
  • Contact: Lanping ZHAO

摘要:

以三换热器汽车热泵系统中的内部冷凝器为研究对象,实验研究了迎风面积与厚度相等时单层二流程与双层四流程的性能差别,发现双层冷凝器比单层的换热能力最大可增加7.9%,但压降增加了177.6%。建立了双层四流程冷凝器一维仿真模型,研究了当制冷剂为R134a与R1234yf时其在不同结构下的换热量与制冷剂侧压降。结果表明:不同流程排布的换热量差别较小,排布为11-12-12-11时,各个工况的R134a侧压降都显著减小;固定第二层厚度,第一层厚度从10 mm到20 mm,高风速工况下R134a的换热量最大增加10.4%,压降最大可减小63.6%;固定总厚度,采用不同的两层厚度组合,换热量变化较小,存在性能较优的两层厚度组合16 mm-8 mm与14 mm-10 mm;制冷剂为R1234yf时换热量和压降分别比R134a降低了8.02%和47.0%。

关键词: 车用热泵, 内部冷凝器, 结构参数, R1234yf, 微通道, 传热, 气液两相流

Abstract:

The inner condenser for electric vehicle (EV) heat pump system of the three heat exchangers type was experimentally studied, it was found that the heat transfer capacity difference between the double-layer four-pass condenser and the single-layer two-pass condenser was as high as 7.9%, under the same overall dimensions, and corresponding pressure drop difference of refrigerant side was 177.6%. A one-dimensional simulation model of the double-layer four-pass inner condenser was established to investigate its thermal-hydraulic performance under different structural parameters with refrigerant R134a as well as R1234yf. The simulation results showed that, pressure drop of refrigerant side decreased significantly when the pass arrangement is 11-12-12-11 when the refrigerant was R134a, while the heat transfer capacity was insensitive to the pass arrangement. When the thickness of the second layer of the double-layer condenser was fixed and the thickness of the first layer increased from 10 mm to 20 mm, the heat transfer rates of R134a can be increased by 10.4%, however, pressure drop can be decreased by 63.6%, under the conditions of high air flow rate. When the total thickness of the double-layer condenser was fixed, two thicknesses combinations of the first layer and the second layer as 16 mm-8 mm and 14 mm-10 mm could achieve better overall thermal-hydraulic performance, and the difference of heat transfer rate can be negligible. Under the airflow rate of 732 m3/h, the condenser of the thickness combination of 14 mm-10 mm reduced the pressure drop by 35.19% for R134a, compared to the one of 10 mm-14 mm. When the refrigerant is R1234yf, the heat exchange and pressure drop are reduced by 8.02% and 47.0% respectively compared with R134a.

Key words: heat pump system for electric vehicle, inner condenser, structural parameter, R1234yf, microchannels, heat transfer, gas-liquid flow

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